Valve and seat grinding tool



Feb. 20, 1962 V..M FULLER ETAL VALVE AND SEAT GRINDING TOOL 2 Sheets-Sheet 1 Filed July 24. 1959 Var/0n M. Fuller Dana/d A. Weaver ZNVENTORS BY @4062 Mr nqs 1962 v. M. FULLER ETAL 3,021,651

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Var/on M. Fuller Dona/d A. Weave/ INVENTORS BYQ United States Patent() 3,921,651 VALVE AND SEAT GRENDING TOGL Vet-ion M. Fuller, 2% Qountry Club Road, North Little Rock, Arln, and Donald A. Weaver, 814 W. 2nd St, Little Rock, Ark.

Filed July 24,. 1959, Ser. No. 829,300 2 Qlaims. (Cl. 51-241) valve faces and the valve seats of the engine in his automobile with the minimum amount of equipment and at a relatively low cost so that mechanically minded automobile owners may more readily perform the job of grind- .in the valves of their automobile engines themeslves.

. The valve grinding attachment is specifically adapted to be powered by a conventional form of electric drill which many of the do-it-yourself enthusiasts have already secured to do various other jobs which may be accomplished by a portable electric drill.

The tool has been specifically designed so that the parts which are subject to wear may be readily replaced at a nominal cost. Thus, even after performing one or more valve grinding operations on his own automobiles, the attachment may be used by friends or other persons who also wish to perform the same operation to their automobiles. Further, the attachment has been so designed so that it may also be used with substantially every form of internal combustion engine utilizing poppet valves for the entrance of a combustible mixture into the combustion chamber of an engine and the discharge of the exhaust gases therefrom.

Many persons have as a hobby the repairing of various forms of internal combustion engines and the tool comprising the present invention has been designed so that it may be used again and again for the process of grinding valves and valve seats. Further, with the increasing demand for power lawn mowers and other tools having internal combustion engines as the power source, repair shops whose business includes the repair of these tools will find that this invention represents a relatively inexpensive tool which may be used very effectively to grind valves and valve seats.

The main object of this invention is to provide a relatively inexpensive tool which is quickly adapted to grind either the valve face or the valve seats of an internal combustion engine and a tool that may be conveniently powered by a conventional form of portable electric power drill.

A further object of this invention, in accordance with the preceding object, is to provide an attachment which may be utilized to face the grinding surface of the grinding wheel to any desired angle which enables the tool to be used in connection with internal combustion engines having valve faces and valve seats of varying degrees of inclination.

A final object to be specifically enumerated herein is to provide a valve seat and grinding tool which will conform to conventional forms of manufacture and be relatively sturdy and simple in construction so as to provide -ment with bore 20 formed therein.

3,21,653 Patented Fee. 20, 1962 These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a side elevational view of the valve and seat grinding tool shown removably secured to the chuck of a conventional form of portable electric power drill with the grinding stone being shown in phantom lines in position grinding the face of a conventional form of poppet valve;

FIGURE 2 is an enlarged exploded perspective view of the valve and seat grinding tool showing the manner in which the tool is assembled;

FIGURE 3 is a longitudinal vertical sectional view of the invention shown mounted in position to re-face the valve seat of an internal combustion engine;

FIGURE 4 is a side elevational view of the tool like that of FIGURE 1 but with the tool dresser attachment l lines;

, FIGURE 5 is a top plan view of the attachment as seen in FIGURE 4 but with the portable electric power drill removed; and

FIGURE 6 is a fragmentary view of the tool dresser as seen in FIGURE 4, but showing the tool dresser facing the opposite face of the grinding wheel.

Referring now more specifically to the drawings, the numeral 10 generally designates the valve and seat grinding tool comprising the present invention. The tool 10 comprises a cylindrical guide body 12 having a bore 14 formed longitudinally therethrough. Bore 14 is provided with a counterbore 16 which is adapted to slidably receive a cylindrical sleeve 18. The cylindrical sleeve 13 is provided with a longitudinal bore 20 whose purpose is to be hereinafter set forth.

The forward end of the guide body 12 is provided with an externally threaded neck portion 22 which is adapted to removably secure the grinding stone or wheel 24 to the guide body 12 by means of an internally threaded cylindrical hub 26 secured within bore 28 formed through the center of the stone 24.

With attention directed more particularly to FIGURE 3 of the drawings, it will be noted that the stone 24 is provided with a recessed frusto-conical surface 30 on one side and a projecting frusto-conical surface 32 on the other side. It will be understood that the stone 24 may be removably secured to the threaded neck portion 22 with either of the faces 30 or 32 adjacent the guide body 12.

The sleeve 18 may be removably secured within the guide body 12 by means of setscrew 34 which is threadedly engaged in a threaded bore (not shown) which is in communication with bore 16.

A coupling generally referred to by the reference numeral 36 is adapted to either abut the rear end surface 38 of the guide body 12 or be removably secured thereto if it is desired. The rear end 33 of the guide body 12 is provided with a plurality of threaded bores 46 and the coupling 12 is provided with an equal number of apertures 42 which are registrable with bores 40 and adapted to slidingly receive the threaded shank portions 44 of fasteners 46 which may be threadedly engaged in bores 40. The coupling 36 is provided with a longitudinally extending bore 48 which has a counterbore 50. The counterbore 50 is adjacent the guide body 12 and is in align- The coupling 36 is also provided with a suitable number of threaded bores 52 which extend diametrically thereacross and are in communication with counterbore 50. Threadedly engaged in each of the threaded bores 52 is a setscrew 54 whose purpose is to be hereinafter set forth.

Bore 43 is of sufiicient diameter to slidingly receive one end portion of a flexible shaft 56 which is removably secured therein by means of lockpin 5E. The other end of the flexible shaft (not shown) is adapted to be removably secured within the conventional form of chuck 60 secured to the output shaft (no-t shown) of a portable electric drill 62.

With attention now directed more particularly to FIG- URES 4 through 6, it will be seen that there is provided a tool dresser generally referred to by the reference numeral 64;. The tool dresser 64 has on one end a guide shaft 66 which is adapted to be slidingly received and rotatably journalled within bore 20. The other end of the tool dresser attachment 64 comprises a body 68 whose remote end 7i) is adapted to be engaged between the jaws of a vise '72. Rotatably journalled on the body 68 about an axis extending transversely thereof by means of pivot bolt 74 is an attachment arm 76 having on its outer end an elbow portion 73 having a non-circular opening 80 formed therethrough. A dressing shaft 82 having a cross-section complementary to opening 80 is slidably received therein and has on one end an operating knob 84- and on the other end a transversely extending threaded bore (not shown). Threadedly engaged in the last mentioned bore is an externally threaded dressing tool 86 having a diamond or other suitable stone engaging tip 38 thereon for dressing either the surface 3% or 32 of the grinding stone 24. The attachment arm 76 is provided with a circular enlargement on the end adjacent the body 68 which has suitable indicia 9i} thereon which will indicate by means of pointer 92 the angle of the bore 80 relative to the guide shaft 66 which coincides with the axis of rotation of the grinding stone 24.

In operation, with attention drawn more particularly to FIGURE 1 of the drawings, when it is desired to face the surface of a conventional form of poppet valve 94, the flexible shaft 56 is secured within chuck 60 and the valve stem as i secured within counterbore 50 by means of setscrews 54. The fasteners 46 are not used to secure the coupling St? to the guide body 12 and it will be apparcut that the latter including the grinding stone 24 may then be moved longitudinally of the valve stem 96 until face 3% engages the seat of the valve 94. With the electric drill 62 operating, the coupling 36, secured to the valve stem 96 rotates the valve 94 so that when it is brought into contact with the face 30 the seat of the valve 94 will be ground to that angle at which the face 36 of the stone is ground. A person grinding the face of the valve 94 would hold the drill 62 in one hand and the guide body 12 in the other hand moving the guide body 12 back and forth along the valve stem Q6 moving the face 30 into and out of engagement with the seat of the valve 94 until the seat was ground true.

With attention now drawn more particularly to FIG- URE 3 of the drawings, it will be seen that a guide shaft 98 is positioned within the valve guide 100 that is secured within the motor block 162 in alignment with the valve seat 104. The coupling 36, when it is desired to grind the valve seat of a motor, is removably secured to the guide body 12 by means of fasteners 46 and the end of the guide shaft 38 received within counterbore 50 is removably secured therein by means of setscrews 54, the guide shaft 98 being secured for rotation with guide body 12 -by means of setscrew 34. When the flexible shaft 56 rotates the coupling 36 the stone 24 also rotates with the end of the guide rod 98 extending through the grinding stone 24 being rotatably journalled and slidably received within the valve guide 100 so that the drill 62 may be moved towards and away from the seat 104 with the guide shaft 98 sliding in the valve guide 100 as the face 32 of the grinding stone 24 is brought into and out of engagement with the seat 104 until the latter has been ground to the correct degree.

it will be noted that the stone 24 is reversed in position when grinding valve seat 104 so that the face 32 may project into the seat 1 34.

With attention now drawn more particularly to FIG- URES 4 through 6 of the drawings, when it is desired to true either of the faces 30 or 32 of the grinding stone 24, the coupling 36 secured to the guide body 12 by means of fasteners 46 and the guide shaft 66 of the tool dresser 64 is rotatably journa led and slidingly disposed within bore 20. The attachment arm 76 is rotated to the desired position and secured in that position upon the tightening of retaining nut 1% on the bolt 74 whereupon the diamond point 88 on the end of the dressing shaft 86 may be moved into contact with either the surface 30 as shown in FIGURE 6 or the surface 32 of the grinding wheel 24 as shown in FIGURE 4 to dress the surfaces of the stone to the desired angle. It is to be understood that any convenient mean may be utilized to position the guide shaft 66 relative to the grinding wheel 24 so that the latter will be held in correct position relative to the diamond point 88 during the process of truing either the face 30 or 32 of the stone 24. Most conveniently, the free end of the guide shaft 66 may abut against the adjacent end of the flexible shaft 56 with the diamond point 83 then being adjustably positioned by turning the dressing tool 86 within the threaded bore (not shown) formed in the end of the dressing shaft 82. In this manner, the diamond point 38 may be correctly positioned relative to the plane of the desired surface 32 on the stone 24, and upon the operation of the drill 62 the dressing shaft 82 may be moved longitudinally to cause the movement of the diamond point 88 across the surface 32 of the stone 24.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is .not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

i. A valve and seat grinding tool comprising a guide body having a first bore extending therethrough adapted to slidingly receive and rotatably journal a valve stem, a coupling having one end adapted to abut against one end of said guide body, a second bore formed through said coupling alignable with said first bore and having a portion adjacent said one end adapted to slidingly re ceive a valve stem, means on said coupling adapting the latter to be removeably secured to a conventional drill chuck, means in said coupling adapted to removably retain a valve stem in position within said second bore, a valve grinding wheel, said wheel having a recess on one side adapted to grind the face of a conventional form of poppet valve, means removably securing said wheel to said body with said recess remote therefrom, a counterbore formed in said first bore, a cylindrical sleeve slidably disposed in said counterbore, means removably securing said sleeve in position within said counterbore for rotation with said guide body, said sleeve having a third bore formed therethrough in alignment with said first bore and adapted to slidingly receive a valve stem.

2. A valve and seat grinding tool comprising a guide body having a first bore extending therethrough adapted to slidingly receive and rotatably journal a valve stem, a coupling having one end adapted to abut against one end of said guide body, a second bore formed through said coupling alignable with said first bore and having a portion adjacent said one end adapted to slidingly receive a valve stem, means on said coupling adapting the latter to be removably secured to a conventional drill chuck, means in said coupling adapted to removably retain a valve stem in position within said second bore,

a valve grinding wheel, said wheel having a recess on one side adapted to grind the face of a conventional form of poppet valve, means removably securing said wheel to said body with said recess remote therefrom, a guide shaft having one end adapted to be positioned in a valve guide of an internal combustion engine and the other end rotatably and slidably received in said first bore, said grinding wheel having a frusto-conical projection on the other side adapted to grind a valve seat of said engine,

means removably securing said grinding wheel to said guide body with said projection remote from said body, and means removably attaching said coupling to said guide body for rotation therewith, a counterbore formed in said first bore, a cylindrical sleeve slidably disposed in said counterbore, means removably securing said sleeve in position within said counterbore for rotation with said guide body, said sleeve having a third bore formed therethrough in alignment with said first bore and adapted to slidingly receive a valve stem.

References Cited in the file of this patent UNITED STATES PATENTS Clarlcson May 23, Fnshs Oct. '3, Davis July 12, Hall July 19, Roy Feb. 11, Quinn Dec. 23, Earl], Nov. 27, Boyce Mar. 24, Arp Nov. 6,

FOREIGN PATENTS Great Britain May 3, France Sept. 24, 

